Yes Di2 is the electronic shifting and I love it..
I was a bit leery of it at 1st but mainly because I had never used it I guess. Now that I have it, I don't think I can ever go back to mechanical shifting again..
It's much smoother and it's instantaneous.. With the new software update you can rapid shift as well by holding the button down..
OP, my apologies for taking over this thread with my bike..